feat: add conventional PR title workflow

[jamestelfer]

Purpose

Enforces Conventional Commits formatting on PR titles across the repo.
Consistent PR titles keep the commit history machine-readable when using a
squash-merge workflow, making changelog generation reliable and the project
history easy to navigate.

The check is implemented via a shared reusable workflow in chinmina/.github,
so the enforcement rule and its underlying action are maintained in one place
across the org.

Context

• Reusable workflow: https://github.com/chinmina/.github/blob/verified-actions/.github/workflows/conventional-pr-title.yml
• Uses amannn/action-semantic-pull-request v6.1.1 pinned by SHA

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e6f21238-0e8b-4288-8b1c-8711ddee3fe4

📥 Commits

Reviewing files that changed from the base of the PR and between 9653f8a and c4df6f3.

📒 Files selected for processing (1)

• .github/workflows/conventional-pr-title.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-conventional-pr-title

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[github-actions]

Branch preview

🔗 https://add-conventional-pr-title.chinmina.pages.dev (direct commit link)